212443330 has 24 divisors (see below), whose sum is σ = 420324156. Its totient is φ = 77251680.

The previous prime is 212443303. The next prime is 212443333. The reversal of 212443330 is 33344212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 186950929 + 25492401 = 13673^2 + 5049^2 .

It is a super-2 number, since 2×212443330² = 90264336922977800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (212443333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86577 + ... + 88996.

Almost surely, 2^212443330 is an apocalyptic number.

212443330 is a deficient number, since it is larger than the sum of its proper divisors (207880826).

212443330 is a wasteful number, since it uses less digits than its factorization.

212443330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175602 (or 175591 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 212443330 is about 14575.4358425400. The cubic root of 212443330 is about 596.6885444298.

Adding to 212443330 its reverse (33344212), we get a palindrome (245787542).

It can be divided in two parts, 2124 and 43330, that added together give a palindrome (45454).

The spelling of 212443330 in words is "two hundred twelve million, four hundred forty-three thousand, three hundred thirty".